It was pretty funny, actually. It seemed like she was starting to hit on one of the girls, standing really close and rubbing her arms and stuff. Then the other girl was getting jealous. Then she started haphazardly flirting with one of the guys, perhaps to get her presumed girlfriend jealous. I don't know, and I didn't really mind or care.
I was talking to one of my friends after the concert, jokingly guessing as to what was up with the group in front of us. And she, in a very condescending tone, suggested, "Well maybe they're just a bunch of bisexuals."
... What? I was quite literally speechless. I simply did not know how to react to her display of such ignorance. And so, I did something I greatly regret: I said said nothing and shrugged it off. What kind of friend is she if I'm afraid to speak my mind to her for fear of judgement?